package top.lingchen.bootwebadmin.interceptor;

import lombok.extern.java.Log;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @Author 凌宸
 * @create 2021-12-07 下午 9:34
 * @Description 登录检查, 配置好拦截器要拦截哪些请求，把这些拦截器放入容器中
 * @Version 1.0
 */
@Slf4j
public class LoginInterceptor implements HandlerInterceptor {
    /**
     * 目标方法执行之前
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String requestURI = request.getRequestURI();
        log.info("拦截的路径是：" + requestURI);
        // 登录检查逻辑
        HttpSession session = request.getSession();
        Object loginUser = session.getAttribute("loginUser");
        if(loginUser != null){
            return true;
        }else {
            // 拦截住，未登录，跳转到登录页
            request.setAttribute("msg", "请先登录");
//            response.sendRedirect("/");
            request.getRequestDispatcher("/").forward(request, response);
            return false;
        }
    }

    /**
     * 目标方法执行之后
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    /**
     * 页面渲染之后
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
